US3191675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of oil
Assignee: Phillips Petroleum Co
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Filing: 1961-06-30
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Granted: 1965-06-29
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Expires: 1981-06-30
Abstract
No abstract record available.
Inventors
- 👤 Ralph E Gilchrist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:57
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
IN A MISCIBLE PHASE DISPLACEMENT PROCESS FOR PRODUCING OIL FROM AN OIL-BEARING RESERVOIR PENETRATED BY AN INJECTION WELL AND A PRODUCTION WELL W HEREIN A QUANTITY OF VISCOSITY REDUCER MISCIBLE WITH THE RESERVOIR OIL IS INJECTED THRU SAID INJECTION WELL INTO SAID RESERVOIR TO ESTABLISH A TRANSITION ZONE BETWEEN THE OIL AND SAID VISCOSITY REDUCER AND DRIVING FLUID IS INJECTED THRU SAID INJECTION WELL BEHIND SAID VISCOSITY REDUCER TO DRIVE SAME, ALONG WITH OIL, THRU SAID RESERVOIR TOWARD SAID PRODUCTION WELL, THE IMPROVEMENT COMPRISING ESTABLISHING SAID TRANSITION ZONE BY INJECTING SAID QUANTITY OF VISCOSITY REDUCER IN SEPARATE PORTIONS ALTERNATELY WITH SEPARATE PORTIONS OF HEAVY OIL COMPATIBLE WITH THE RESERVOIR OIL AND WITH SAID VISCOSITY REDUCER, SAID PORTION OFVISCOSITY REDUCER INCREASING GRADUALLY IN VOLUME FROM A PORTION LESS THAN 0.25 OF THE VOLUME OF THE FIRST PORTION OF OIL AND THE PORTIONS OF OIL GRADUALLY DECREASING IN VOLUME UNTIL THE LAST PORTION OF OIL IS LESS THAN 0.25 OF THE VOLUME OF THE ADJACENT PORTION OF VISCOSITY REDUCER.
Claim 2
Dependent Claim
167 words
IN A MISCIBLE PHASE DISPLACEMENT PROCESS FOR PRODUCING OIL FROM AN OIL-BEARING RESERVOIR PENETRATED BY AN INJECTION WELL AND A PRODUCTION WELL W HEREIN A QUANTITY OF VISCOSITY REDUCER MISCIBLE WITH THE RESERVOIR OIL IS INJECTED THRU SAID INJECTION WELL INTO SAID RESERVOIR TO ESTABLISH A TRANSITION ZONE BETWEEN THE OIL AND SAID VISCOSITY REDUCER AND DRIVING FLUID IS INJECTED THRU SAID INJECTION WELL BEHIND SAID VISCOSITY REDUCER TO DRIVE SAME, ALONG WITH OIL, THRU SAID RESERVOIR TOWARD SAID PRODUCTION WELL, THE IMPROVEMENT COMPRISING ESTABLISHING SAID TRANSITION ZONE BY INJECTING SAID QUANTITY OF VISCOSITY REDUCER IN SEPARATE PORTIONS ALTERNATELY WITH SEPARATE PORTIONS OF HEAVY OIL COMPATIBLE WITH THE RESERVOIR OIL AND WITH SAID VISCOSITY REDUCER, SAID PORTION OFVISCOSITY REDUCER INCREASING GRADUALLY IN VOLUME FROM A PORTION LESS THAN 0.25 OF THE VOLUME OF THE FIRST PORTION OF OIL AND THE PORTIONS OF OIL GRADUALLY DECREASING IN VOLUME UNTIL THE LAST PORTION OF OIL IS LESS THAN 0.25 OF THE VOLUME OF THE ADJACENT PORTION OF VISCOSITY REDUCER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-28 | 1968-12-28 | 1969-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-28 | 1972-12-28 | 1973-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-28 | 1976-12-28 | 1977-06-29 | $7700.00 | Window Closed / Lapsed |